BAO Apollo Tower — Can you control the incoming and outgoing traffic of Washington National or Chicago O'Hare airports?... Now, Tower allows you to find out!

Air
Command — You are an Air Traffic Controller who must guide all the planes that appear on your radar safely to their destinations.

ProController — Simulated air traffic control with live simulator pilots using SquawkBox on Flight Simulator 95/98 and best of all, it's Free! ProController adds real-time air traffic control (this program) to FS95 or FS98 through a worldwide network of servers which connect you to users of SquawkBox (the pilot client).